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1 June 2007 Invasion by Fallopia japonica increases topsoil mineral nutrient concentrations
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Fallopia japonica is one of the most troublesome alien invasive plants across temperate regions, with large negative impacts on plant species diversity. We examined its impacts on topsoil chemistry and nutrient stocks in standing biomass at 6 sites with contrasting resident plant communities in Belgium. Topsoil and biomass were sampled in invaded and closely adjacent uninvaded plots. Standing biomass and mineral nutrient concentrations in soil (ammonium acetate exchangeable cations and P, total C, and N) and plants were determined. Soil under F. japonica generally had higher exchangeable nutrient concentrations (Cu: 45%, K: 34%, Mg: 49%, Mn: 61%, P: 44%, Zn: 75%). Standing biomass was 3- to 13-fold higher depending on site. Despite lower nutrient concentrations in aboveground biomass, invaded stands had 3.2- to 5.4-fold larger nutrient stocks in aboveground biomass compared to the resident vegetation. We conclude that F. japonica enhances nutrient cycling rates and topsoil fertility, probably due to nutrient uplift. The impacts were greatest in sites with low nutrient concentrations in uninvaded plots, suggesting that F. japonica may contribute to soil homogenization in invaded landscapes.

Nicolas DASSONVILLE, Sonia VANDERHOEVEN, Wolf GRUBER, and Pierre MEERTS "Invasion by Fallopia japonica increases topsoil mineral nutrient concentrations," Ecoscience 14(2), 230-240, (1 June 2007).[230:IBFJIT]2.0.CO;2
Received: 26 June 2006; Accepted: 4 January 2007; Published: 1 June 2007

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